Alunogen Mineral Data
General Alunogen Information
Chemical Formula:
Al2(SO4)3•17(H2O)
Composition:
Molecular Weight = 648.41 gm
Aluminum 8.32 % Al 15.72 % Al2 O3
Hydrogen 5.29 % H 47.23 % H2 O
Sulfur 14.84 % S 37.04 % SO3
Oxygen 71.56 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Al2 (SO4 )3 •17(H2 O)
Environment:
Secondary mineral commonly associated with coals and pyritiferous shales in arid regions.
IMA Status:
Valid Species (Pre-IMA) 1832
Locality:
Alum Mountain district, Grant County, New Mexico, USA. Link to MinDat.org Location Data.
Name Origin:
From the Latin alumen ="alum" and the Greek genos ="origin."
Name Pronunciation:
Alunogen
Synonym:
Aluminum Sulfate
Doughtyite
ICSD 4292
Keramohalite
PDF 26-1010
Alunogen Image
Images:
Images:
Images:
Alunogen Crystallography
Axial Ratios:
a:b:c =0.2751:1:0.2247
Cell Dimensions:
a = 7.42, b = 26.97, c = 6.062, Z = 2; alpha = 89.95°, beta = 97.566°, gamma = 91.888° V = 1,201.90 Den(Calc)= 1.79
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 4.49(1), 4.33(0.8), 4.39(0.8), 13.5(0.6), 3.68(0.5), 3.9(0.5), 3.02(0.4),
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Physical Properties of Alunogen
Cleavage:
{010} Perfect, {100} Very Good, {313} Distinct
Color:
White, Yellowish white, Reddish white, Yellowish white.
Density:
1.65 - 1.78, Average = 1.71
Diaphaneity:
Transparent
Fracture:
Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Fibrous - Crystals made up of fibers.
Hardness:
1.5-2 - Talc-Gypsum
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Alunogen
Gladstone-Dale:
CI meas = -0.072 (Fair) - where the CI = (1-KPDmeas /KC ) CI calc = -0.027 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2657,KPDmeas = 0.2774,KC = 0.2587 Ncalc = 1.43 - 1.46
Optical Data:
Biaxial (+), a=1.473, b=1.474, g=1.48, bire=0.0070, 2V(Calc)=46, 2V(Meas)=31-69. Dispersion none.
Calculated Properties of Alunogen
Electron Density:
Bulk Density (Electron Density)=1.88 gm/cc note: Specific Gravity of Alunogen =1.79 gm/cc.
Fermion Index:
Fermion Index = 0.0014640919 Boson Index = 0.9985359081
Photoelectric:
PEAlunogen = 1.26 barns/electronU=PEAlunogen x r Electron Density= 2.37 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Alunogen is Not Radioactive
Alunogen Classification
Dana Class:
29.08.06.01 (29) Hydrated Acid and Sulfates
(29.08) where (A)2 (XO4)3 � x(H2O)
(29.08.06) Dana Group
29.08.06.01 Alunogen Al2(SO4)3•17(H2O) P1 1
Strunz Class:
07.CB.45 07 - SULFATES (SELENATES, TELLURATES)
07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
07.CB -With only medium-sized cations
07.CB.45 Alunogen Al2(SO4)3•17(H2O) P1 1
07.CB.45 Meta-alunogen Al4(SO4)6•27(H2O) Mono
Other Alunogen Information
References:
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Alunogen :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST
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Alunogen
Al2(SO4)3•17(H2O)
Dana No: 29.08.06.01 Strunz No: 07.CB.45
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